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The start-line and HTTP headers of the HTTP message are collectively known as the head of the requests, whereas its payload is known as the body. The presence of the body and its size is specified by the start-line and HTTP headers. An optional body containing data associated with the request (like content of an HTML form), or the document associated with a response.A blank line indicating all meta-information for the request has been sent.An optional set of HTTP headers specifying the request, or describing the body included in the message.A start-line describing the requests to be implemented, or its status of whether successful or a failure.HTTP requests, and responses, share similar structure and are composed of: The HTTP/2 binary framing mechanism has been designed to not require any alteration of the APIs or config files applied: it is broadly transparent to the user. They provide HTTP messages through config files (for proxies or servers), APIs (for browsers), or other interfaces. Web developers, or webmasters, rarely craft these textual HTTP messages themselves: software, a Web browser, proxy, or Web server, perform this action. In HTTP/2, the once human-readable message is now divided up into HTTP frames, providing optimization and performance improvements. In HTTP/1.1, and earlier versions of the protocol, these messages were openly sent across the connection. HTTP messages are composed of textual information encoded in ASCII, and span over multiple lines. There are two types of messages: requests sent by the client to trigger an action on the server, and responses, the answer from the server.

HTTP messages are how data is exchanged between a server and a client. Experimental Feature-Policy: xr-spatial-tracking.Experimental Non-standard Feature-Policy: unsized-media.Experimental Non-standard Feature-Policy: unoptimized-images.Experimental Non-standard Feature-Policy: sync-xhr.Experimental Feature-Policy: speaker-selection.Experimental Feature-Policy: screen-wake-lock.Experimental Feature-Policy: publickey-credentials-get.Experimental Feature-Policy: picture-in-picture.Experimental Non-standard Feature-Policy: oversized-images.Experimental Feature-Policy: magnetometer.Experimental Non-standard Feature-Policy: legacy-image-formats.Experimental Non-standard Feature-Policy: layout-animations.Experimental Feature-Policy: encrypted-media.Experimental Feature-Policy: document-domain.Experimental Feature-Policy: ambient-light-sensor.Experimental Feature-Policy: accelerometer.Reason: CORS preflight channel did not succeed.Reason: CORS header 'Origin' cannot be added.Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'.Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed.Reason: CORS header 'Access-Control-Allow-Origin' missing.Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel.Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'.Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'.Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'.Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'.Reason: CORS request external redirect not allowed.Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'.